Hillary Clinton lead the 2016 presidential race by two percentage points, according to 7-Eleven coffee drinkers, as she and Donald Trump prepared for Wednesday night’s final debate. The Dallas-based convenience store chain says its customers have predicted the last four presidents of the United States.

Every four years since the 2000 election, 7-Eleven has sold red and blue coffee cups for patrons to show support of their presidential candidates. The company introduced purple cups this year for non-partisan voters. That group is the clear winner, accounting for 40 percent of the disposable mugs sold thus far.

Blue cups account for 31 percent of the politicized receptacles sold, compared to 29 percent for the Republican party. Results are updated and mapped daily at 7election.com.

The majority of the 8,500 7-Eleven stores in the United States are franchised and not every store participates in the election promotion.

Clinton wins electoral votes

If purple cups are ignored, the Democratic party wins 15 states in 7-Eleven’s non-scientific poll. Twelve states go to the Republican party and three states are tied.

Assigning electoral votes to those states gives Clinton 248 of the 270 votes needed to win. Trump gets 120. The two candidates battle for the remaining 170 votes.

Most undecided

Vermont is the most non-partisan state, where purple is the color of 66 percent of the promotional cups sold. Blue cups account for 18 percent of sales at 7-Eleven stores in the Green Mountain State. Fifteen percent are Republican red.

Most Democratic

In Missouri and California, 35 percent of the coffee cups sold are blue, more than any other state. Illinois and North Carolina are the only two other states where at least one-third of the cups sold are votes for the Democratic party.

Most Republican

Idaho is the only state where coffee cup sales backing one political party surpassed non-partisan cups, but that might be because only one 7-Eleven location is listed on the results map. At that Post Falls store, 50 percent of the cups sold were red, 41 percent were for the Democratic party and 9 percent were non-partisan.

There are four other states where at least one-third of the cups sold were red: West Virginia, Maine, South Carolina and New York.

Write-in votes

Customers can fill in a blank on the non-partisan cup to write-in a candidate or cause. Customers shared their photos on social networks, using the #7election hashtag. Some people wrote themselves in. Others wrote in controversial topics. New Yorker Christina Cossentino Tuesday tweeted a fill-in a candidate that’s hard to argue against: “kindness.”

Former reporter, editor and web developer Kevin Sablan massages words, images and links to enhance stories and information published on phones, tablets and computers. He designs and codes web tools that help colleagues use online systems.